偶氮染料C.I.酸性红14在水溶液中于表层土壤上的吸附行为
Adsorption behavior of azo dye C. I. acid red 14 in aqueous solution on surface soils.
作者信息
Qu Baocheng, Zhou Jiti, Xiang Xuemin, Zheng Chunli, Zhao Hongxia, Zhou Xiaobai
机构信息
School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
出版信息
J Environ Sci (China). 2008;20(6):704-9. doi: 10.1016/s1001-0742(08)62116-6.
Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior of azo dyes in aqueous solution on DG06, GSE17200, and GSE17201 soils using C. I. Acid Red 14 (AR14) as example. The experimental results indicate that the Freundlich model expresses the adsorption isotherm better than the Langmuir model and the pseudo-second-order model achieves adsorption of AR14 on the three soils well. Based on the pseudo-second-order model, the adsorption thermodynamic of AR14 on DG06 soil have been studied and the thermodynamics parameter of deltaG0 is determined and deltaG0 value shows the adsorption process of AR14 on DG06 is mainly physical in nature. Furthermore, the effects of temperature, pH and salinity (NaCl) on adsorption have been investigated. The decrease in pH or the increase in salinity enhances the adsorption of AR14 by DG06, GSE17200, and GSE17201.
偶氮染料因其与各种人类健康问题相关而受到广泛关注。本研究的目的是以C.I.酸性红14（AR14）为例，确定偶氮染料在水溶液中在DG06、GSE17200和GSE17201土壤上的吸附行为。实验结果表明，Freundlich模型比Langmuir模型能更好地表达吸附等温线，且准二级模型能很好地实现AR14在这三种土壤上的吸附。基于准二级模型，研究了AR14在DG06土壤上的吸附热力学，确定了热力学参数ΔG0，且ΔG0值表明AR14在DG06上的吸附过程主要是物理吸附。此外，还研究了温度、pH值和盐度（NaCl）对吸附的影响。pH值降低或盐度增加会增强DG06、GSE17200和GSE17201对AR14的吸附。
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